default desktop icon size 64

files/xdg/xfce4/xfconf/xfce-perchannel-xml/xfce4-desktop.xml

@@ -165,5 +165,6 @@
     <property name="file-icons" type="empty">
       <property name="show-filesystem" type="bool" value="false"/>
     </property>
+    <property name="icon-size" type="uint" value="64"/>
   </property>
 </channel>